Display screen with a graphical user interface



FIG. 1 is a front view of a display screen with a graphical user interface, showing a first embodiment of the new design;

FIG. 2 is a second embodiment thereof;

FIG. 3 is a third embodiment thereof;

FIG. 4 is a fourth embodiment thereof;

FIG. 5 is a fifth embodiment thereof; and,

FIG. 6 is a sixth embodiment thereof.

The outermost broken line rectangle showing of the display screen and all other broken lines showing portions of the graphical user interface are included for the purpose of illustrating portions of the article and form no part of the claimed design. 

CLAIM The ornamental design for a display screen with a graphical user interface, as shown and described. 